Cement-based Immobilisation Of Municipal
Incinerator Fly Ash And Reuse Of Solidified
Products As A Construction Material
Author(s)
T. Mangialardi, L. Panei & L. Piga
Abstract
A solidification/stabilisation (S/S) process of washed municipal incinerator fly
ash with Portland cement was used to manufacture solidified products with high
ash content (55 and 70 wt.% of solids) and good performance characteristics in
terms of setting, dimensional stability, compressive strength, and environmental
quality. The S/S product containing 70 wt.% fly ash aged for 180 days at 20°C
and 100% RH was used as an artificial aggregate for the production of Portland
cement mortars at four replacement levels of natural sand (0, 10, 50, and 100%
by mass), and a water-to-cement weight ratio (w/c) of 0.62. Control mortars were
also made at a w/c ratio of 0.50. All mortars were cured at 20°C and 100% RH
up to 120 days. No substantial difference in the compressive strength between
superplasticised artificial aggregate-bearing mortars and non-superplasticised
control mortars was found only if the replacement level of natural sand was not
greater than 50% by mass and a w/c ratio of 0.62 was used. All mortars were
able to meet the Dutch regulatory limits for selected heavy metals (Cd, Cr, Cu,
Ni, Pb, and Zn) when subject to the monolith leach test. Portland cement played
an important part in the release of such heavy metals from mortar specimens.
Keywords: municipal incinerator fly ash, solidification/stabilisation, reuse,
cement mortar, compressive strength, leaching behaviour.
1 Introduction
In many industrialised countries, incineration is an increasingly alternative
technology to landfill for the disposal of Municipal Solid Waste (MSW).
Keywords
municipal incinerator fly ash, solidification/stabilisation, reuse,
cement mortar, compressive strength, leaching behaviour.
Related Book
Other papers in this volume
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